Sonia hired Bobby to sell a cottage that she inherited from her grandmother. Bobby received an offer from Ah Ming to buy the cottage for RM500,000. Bobby's sister, Britney also expressed an interest in the cottage and offered to buy it for RM450,000. Bobby accepted Britney's offer and sold the cottage to her. As a token of appreciation, Britney gave Bobby a new Apple watch. Bobby did not inform Sonia about his relationship with Britney and the gift he received from Britney. A few weeks later, Britney saw Ah Ming and learned that he had offered to buy the cottage for RM500,000. Sonia has also discovered that Britney is Bobby's sister. Sonia is angry with Bobby's action and seek you advice on her legal rights against Bobby. With reference to the Contracts Act 1950 and relevant cases, advise Sonia. [ answer using ILAC method]